Steam-generator.



W. N. vBEST.

STEAM GENERATOR. APPLICATION man nus. I2. l9l6- 2 SHEETS-SHEET I.

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W. N. BEST.

STEAM GENERATOR.

APPLICATION FILED AUG-12,1916.

1,21%,889, Patented Jan. 16, 19B.

2 SHEETS-SHEET 2.

IIVVE/VTOH BY WM A ITO/WEI WILLIAM NEWTON BEST, OF BROOKLYN, NEW YORK, ASSIGNOR TO LMARCIA WALTHER DRESSER, OF BROOKLYN, NEW YORK.

STEAM-GENERATOR.

Specification of Letters Patent.

Patented Jan. 16, 191W.

Application filed August 12, 1916. Serial No. 114,536.

To all whom it may concern Be it known that I, WVILLIAM NEWTON BEST, a citizen of the United States, and resident of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Steam-Generators, of which the following is a specification.

This invention relates to steam generators of that type in which the flame and hot gases of combustion are caused to flow through a plurality of lines or tubes in the shell or container for the water and steam. and connected together in series.

The main object of my invention is to secure the generation of the steam by the utilization of the hottest gases at the lowest portion of the generator in order to get the highest efliciency from the gases and at the same time to induce an accelerated circulation of the waterto and from the lowermost and hottest parts of the generator by maintaining a slightly higher temperature at one side than at the other. o

In my improved construction, the flame and gases of combustion are caused to travel lengthwise of the generator at least three times. One of the courses or passage ways for the flame and gases of, combustion and through which they first pass While at the highest temperature is at the lowest part of the water containing shell. Above this are arranged two courses in the form of tubes or fiues arranged at the same or approximately the same elevation. These are connected in series with each other and with the lowermost gas passage so that after the flame and hot gases have passed lengthwise of the generator at the lowermost part they pass lengthwise through flues at one side and at a higher elevation and then through lines at approximately the same elevation as the last mentioned flues adjacent to the opposite side. Thus, the water is subjected to the highest heat at the lowest portion and the automatic circulation which is thereby induced is accelerated by the application of the same gases first at one side and then at the other.

Other important features of my improved construction are involved in the embodiment of my invention which is shown in the accompanying drawings,

In these drawings, Figure 1 is a central, vertical, longitudinal section of the generator embodying my invention; Fig. 2 is a front end view, portions of doors being broken away; and Figs. 3, 1 and 5 are sections 011 the lines 33, fk4 and 55, respectively, of Fig. 1.

In the form illustrated, the generator includes a substantially cylindrical shell 10 mounted in a casing 11 and with its axis approximately horizontal. On the upper side is the usual steam dome 12 and at the lower rear end is a drainage or blow-off pipe 13 protected by suitable fire brick 14, or other insulation. A flue plate or head 15 closes the rear end of the tubular shell while a flue plate or head 16 is spaced inwardly a short distance from the extreme front end of the shell. The said front end is closed in any suitable manner, as for instance, by hinged doors 17. The shell is supported along its sides in any suitable manner by the outer casing 11 and is spaced above the lower portion of the casing a suilicient dis tance to form the combustion chamber 18, beneath the front end of the shell 19 and passage for the flow of the gases therefrom to the rear end of the shell.

The heat may be secured by the combustion of any suitable fuel. The specific construction illustrated is adapted for either liquid or solid fuel. There are provided grate bars 20 above the ash-pit 21, and in the front wall of the casing and below the grate is the ash-pit door 22 and above it is the usual opening 23 for the admission of coal, coke or other solid fuel. In using liquid fuel, such for instance, as tar, heavy oil, or the like, the bridge wall is reduced in height, the grates are covered with a layer or checkerwork of fire brick, 2d, spaced apart to leave air openings therebetween, and the door is removed from the fuel opening 23 the latter being closed, except for a comparatively small aperture 25 by suitable fire brick. Within this aperture is mounted a fuel atomizer or burner 26 connected to a steam or compressed air supply pipe 27, and a tar, oil, or other liquid fuel pipe 28. Steam or other atomizing fluid operates to deliver a substantially fan-shaped sheet of vaporized fuel within the compression chamber 18, the air entering between the fire brick 24 of the grate bars together with the air entering the aperture 25 support the combustion of the fuel. The combustion chamber is preferably substantially triangular in horizontal section, the sides being formed by fire brick 29.

Extending lengthwise of the tubular shell 10 and connected to the tube sheets or plates 15 and 16 are four separate groups of tubes or lines, 30, 31, 32 and 33. The number and size of fines or tubes in each group is sullicient to permit the free flow therethrough from all of the products of combustion and at the ends of the shell are suitable chambers or passages connecting the groups together in series and formed in part by baffles.

The group 30 is adjacent to the bottom of the shell, the groups 31 and 32 adjacent to opposite sides and at the same level while the group 33 is near the top. At the rear end of the shell a baflie 3 L separates the lower group 30 from the remainder of the tubes but permits the entrance of gases from the passage 19 to said group 30. Above this is a somewhat similar but reversely arranged baflie 35 separating the uppermost fines 33 from those below it but permitting said group 33 to communicate with a chimney or stack 36. The groups 31 and 32 may communicate with each other by the passage between the baflles 34: and 35. Within this passage, baflie supports 37 may be placed.

At the front end of the shell and between the flue sheet 16 and the doors 17 is a diagonally disposed baffle 37 which permits the lowermost fines 30 to communicate with the tubes of one of the side groups, such for instance as the tubes 31, and permit the tubes of the other side group, for instance, the fines 32, to communicate with the uppermost flues 33. By this arrangement of flues and bailles, the gases from the combustion chamber 18 flow first rearwardly through the passage 19 beneath the shell to the rear end of the generator, thence forwardly through the lowermost tubes 30, thence through the tubes 31 to the rear end of the generator. Here they cross between the bafiles 34: and 35 to the fines 32 and flow again to the front end of the generator. They are now at the opposite side of the bafile 37 and flow upwardly to the uppermost flues 33 and then through the latter to the rear end of the generator and to the stack 36 which is of sufficient height to permit the consumed and inert gases to pass through the several courses as above described.

The shell or drum and the tubes may be constructed of the usual material and connected in any well-known manner. The baiiling may be of refractory material or metal as desired and should be so constructed that the joints will be substantially gastight and there will be no leakage of gases from one course to another except along the desired paths. The tubes may be readily cleaned upon opening the doors 17.

The construction is simple, inexpensive and durable and provides for the application of the heat where the heat is most required and desired and directs the course of .the heat and the consumed and inert gases in such a way as to utilize as much of the heat as possible. The full value of the heat is thereby secured and the stack temperature is reduced to the minimum.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A steam generator including a shell having four groups of fines extending sub stantially horizontally therethrough, one of said groups being disposed adjacent the lower portion of the shell, one being arranged adjacent the upper portion of the shell and the other two being disposed above the lowermost group and at substantially the same elevation and upon opposite sides of the vertical, medial plane, means at one end of said shell for connecting the uppermost group with one of the side groups and the lowermost group with the other side group and means at 'the opposite end of the shell for connecting together the two side groups whereby gases may be delivered through all of said groups in series.

2. A steam generator including a shell having four groups of flues extending substantially horizontally therethrough, one of said groups being disposed adjacent the lower portion of the shell, one being arranged adjacent the upper portion of the shell and the other two being disposed above the lowermost group and at substantially the same elevation and upon opposite sides of the vertical, medial plane, means at one end of said shell for connecting the uppermost group with one of the side groups and the lowermost group with the other side group and means at the opposite end of the shell for connecting together the two side groups whereby gases may be delivered through all of said groups in series, and means for delivering hot gases to one end of the lowermost group whereby the hottest gases are applied to the lowermost course and one side course receives more heat than the other.

3. A steam generator, including a shell having a plurality of substantially horizon tal flues extending therethrough and including a group at the lower portion of the shell and two groups at a higher level and disposed side by side, means for delivering the heated gases beneath the shell to the rear end of said lower group, means for directing the gases from the opposite end of said lower group to the adjacent end of one of said second mentioned groups, means for directing the gases into the other of said second mentioned groups after they have passed through the first of said second mentioned groups and means for delivering the gases from last of said two groups to the stack.

Signed at New York, in the county of New York, and State of New York, this 9th day of August A. D. 1916.

WILLIAM NEWTON BEST.

Witnesses: m

FLORENOE LEVIEN, C. W. FAIRBANK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, JD. G." a 

